Kyle Isom f9f6f339f4 Add multi-address fallback for node connectivity ...

NodeConfig and MasterNodeConfig gain an optional addresses[] field
for fallback addresses tried in order after the primary address.
Provides resilience when Tailscale DNS is down or a node is only
reachable via LAN.

- dialAgentMulti: tries each address with a 3s health check, returns
  first success
- forEachNode: uses multi-address dialing
- AgentPool.AddNodeMulti: master tries all addresses when connecting
- AllAddresses(): deduplicates primary + fallback addresses

Config example:
  [[nodes]]
  name = "rift"
  address = "rift.scylla-hammerhead.ts.net:9444"
  addresses = ["100.95.252.120:9444", "192.168.88.181:9444"]

Existing configs without addresses[] work unchanged.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-03 09:45:50 -07:00

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